Ok so here is an easy way to reproduce the sleep problem:
With topcom installed, I get a bunch of sleep calls when I compute the
volume of a triangle:
sage: p = Polyhedron([(0,1/3),(0,1),(1/3,1)])
sage: %prun p.volume()
750 function calls (749 primitive calls) in 0.216 seconds
Ordered by: internal time
ncalls tottime percall cumtime percall filename:lineno(function)
5 0.201 0.040 0.201 0.040 {time.sleep}
3 0.006 0.002 0.006 0.002 {posix.read}
1 0.004 0.004 0.004 0.004 {posix.forkpty}
4 0.001 0.000 0.001 0.000 {select.select}
1 0.000 0.000 0.001 0.001
point_configuration.py:1291(volume)
2 0.000 0.000 0.215 0.107
point_configuration.py:671(_TOPCOM_communicate)
1 0.000 0.000 0.216 0.216 base.py:5201(volume)
21 0.000 0.000 0.000 0.000 {posix.lstat}
1 0.000 0.000 0.010 0.010 ptyprocess.py:172(spawn)
1 0.000 0.000 0.000 0.000 matrix_space.py:720(__call__)
1 0.000 0.000 0.000 0.000 ptyprocess.py:152(__init__)
1 0.000 0.000 0.000 0.000
matrix_space.py:432(__classcall__)
2 0.000 0.000 0.214 0.107
point_configuration.py:597(_TOPCOM_exec)
1 0.000 0.000 0.216 0.216 <string>:1(<module>)
6 0.000 0.000 0.000 0.000 expect.py:13(new_data)
4 0.000 0.000 0.002 0.001 expect.py:91(expect_loop)
4 0.000 0.000 0.000 0.000 contextlib.py:21(__exit__)
1 0.000 0.000 0.000 0.000 {method 'close' of
'_io.FileIO' objects}
4 0.000 0.000 0.000 0.000 ptyprocess.py:670(isalive)
1 0.000 0.000 0.000 0.000
matrix_space.py:103(get_matrix_class)
4 0.000 0.000 0.000 0.000
spawnbase.py:192(compile_pattern_list)
2 0.000 0.000 0.101 0.050 pty_spawn.py:526(send)
21 0.000 0.000 0.000 0.000 posixpath.py:132(islink)
3 0.000 0.000 0.000 0.000 base.py:2062(dim)
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